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Kossalin — hair strengthening shampoo
A daily-care shampoo that helps hair look fuller and stronger while leaving the scalp feeling fresh and comfortable.
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Home · Hair · HairFlex
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Hair
HairFlex — leave-in hair serum
4,6 / 5 · 150 reviews
€39
A lightweight leave-in serum that supports fuller-looking, vital hair day after day.
Delivery in 1–3 working days
30-day money-back guarantee
- Supports the feel of fuller, denser hair with regular use
- Helps maintain a well-cared-for, balanced scalp
- Leaves hair softer, shinier and easier to comb through
- Light formula that absorbs fast and does not weigh hair down
- Suitable for everyday care of all hair types
How cash on delivery works
Three steps to your door
1Order onlineFill in a short form — name, phone and address. No account, no card.
2We confirm by phoneWe call you within 24 hours to confirm your order and arrange delivery.
3Pay the courierYour parcel arrives in 1–3 working days. You pay in cash only when you receive it.
Ingredients
What's inside
| Ingredient | Amount | Role |
|---|---|---|
| Caffeine | 2% | a well-known hair-care ingredient that gives the scalp a fresh feel and the roots a vital look |
| Niacinamide (vitamin B3) | 4% | contributes to a well-cared-for, healthy-looking scalp |
| Panthenol (pro-vitamin B5) | 1% | helps maintain the hydration and softness of the hair strands |
| Rosemary extract | 1.5% | refreshes the scalp and gives a feeling of vitality |
| Arginine | 0.5% | an amino acid that contributes to a more resilient look of the hair |
Apply a few drops to a clean, towel-dried scalp once a day, massage in gently with your fingertips and leave in without rinsing, using it regularly for at least 8 to 12 weeks.
Customer experiences
What people who tried it say
ER
Elena R.Valencia
I have been using the serum for two months now. My hair looks fuller and combs through much more easily, and it does not feel greasy at all.
Verified purchase
DK
Daniel K.Manchester
What I like is how quickly it absorbs — it leaves no trace on the pillow, and my scalp feels refreshed after every application.
Verified purchase
TB
Tomas B.Prague
I ordered with cash on delivery and the parcel arrived in three days. My hair looks shinier, so I am happy with it.
Verified purchase
Frequently asked questions
Everything you want to know
Is it safe for everyday use?
Yes. HairFlex is a cosmetic product for external use, formulated for gentle daily scalp care. If you have a sensitive scalp or a known allergy to any ingredient, do a patch test on a small area of skin first.
When can I expect the first results?
Hair is individual, but most users notice a better-cared-for and fuller look after 8 to 12 weeks of regular use.
How do I pay for my order?
You pay cash on delivery — the courier collects the payment when he hands over the parcel, so nothing is charged in advance and no card details are needed.
How long does delivery take?
Orders are usually dispatched within one business day and reach you in about 2 to 5 business days, depending on your area.
Can I use it on coloured hair?
Yes, the formula is suitable for coloured and chemically treated hair as well.
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Your order
Order HairFlex — cash on delivery
Choose your package and enter your delivery details. You pay only when the parcel arrives at your address.